640880750 has 16 divisors (see below), whose sum is σ = 1199729232. Its totient is φ = 256352200.

The previous prime is 640880707. The next prime is 640880771. The reversal of 640880750 is 57088046.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1281512 + ... + 1282011.

It is an arithmetic number, because the mean of its divisors is an integer number (74983077).

Almost surely, 2^640880750 is an apocalyptic number.

640880750 is a deficient number, since it is larger than the sum of its proper divisors (558848482).

640880750 is a wasteful number, since it uses less digits than its factorization.

640880750 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2563540 (or 2563530 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 38.

The square root of 640880750 is about 25315.6226468953. The cubic root of 640880750 is about 862.1690111338.

The spelling of 640880750 in words is "six hundred forty million, eight hundred eighty thousand, seven hundred fifty".